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HOWTO: SLI on a non-SLI Motherboard (GTX5xx compatible 1.0 final released!) - Page 5

post #41 of 1985
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Quote:
Originally Posted by bjorgein View Post
Would this work with a DFI 975x board Crossfire ready? I want to run two 8800gts in SLI. I see that other 975 chipset boards are compatible but i'm not sure if this one would be.
It appears it's not hardware dependent, as long as you have the full speed PCIe slots it should be doable.
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post #42 of 1985
Quote:
Originally Posted by DeadSkull View Post
Works on my Gigabyte EP45-UD3P and two GTX 285s no problem.

I got the best of both worlds for lga775 set up
Really? I tried on the same exact board. with two GTS 250s and Windows 7 x64 with SLI patch 0.7... I can turn SLI on but every time it changes back to disabled was within a few seconds. Why does it do this?

Can anyone help me out?
post #43 of 1985
Quote:
Originally Posted by wiz View Post
Really? I tried on the same exact board. with two GTS 250s and Windows 7 x64 with SLI patch 0.7... I can turn SLI on but every time it changes back to disabled was within a few seconds. Why does it do this?

Can anyone help me out?
It works great for me. I am running Windows 7 x64 Pro and 196.21.
post #44 of 1985
Okay, I reset my BIOS sets to defaults and it started to work! Now I'm slowly in the process of switching them all back to see which one was causing the issue. But otherwise, for me it now works. using two GTS 250 cards! heck yes
post #45 of 1985
I'd love to see some benchmarks!
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post #46 of 1985
I would love to see some stats on what boards us OCN guys have done this to and the results of it.Most of the boards and cards used are not relevant to the newer cards.We need a new spread sheet.I want a UD3P for my Q9550 but want to SLI my 285.
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post #47 of 1985
Getting ready to do this soon for my girlfriends rig, shes taking my 8800 for hers when I get my Fermi.

Do you recommend the patch, or driver method? Driver method looks a bit sketchy.. only one version of a driver you can never update from?
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post #48 of 1985
Quote:
Originally Posted by allenottawa View Post
I'd love to see some benchmarks!
I benchmarked my two GTS 250s in SLI and without SLI. My complete system spec is listed below in my signature. Here's some results:

Without SLI:
3DMark Score: P6556 3DMarks
CPU Score: 5973
Graphics Score: 6776

With SLI Enabled (Without SLI Bridge):
3DMark Score: P9615 3DMarks
CPU Score: 6008
Graphics Score: 12020

I also benchmarked Crysis with one of the benchmarking tools available online. I'll give you the run down...

Without SLI:
DX10 1440x900 AA=8xQ, 64 bit test, Quality: VeryHigh ~~ Overall Average FPS: 15.825

With SLI Enabled (Without SLI Bridge):
DX10 1440x900 AA=8xQ, 64 bit test, Quality: VeryHigh ~~ Overall Average FPS: 27.21

I bought a cheap SLI bridge off of eBay and I'll post another benchmark when it's all hooked up, but honestly looking at these results I don't think it's going to get much better than this.

But this confirms it... Just because your motherboard isn't certified to do SLI, it doesn't mean it can't do it, or that it won't do it well.
post #49 of 1985
I've attempted to do this (all weekend) on my P55A-UD3 and have not succeeded.

The closest I have gotten is seeing SLI enabled, however all processing hits GPU#2 and GPU#1 just hangs out. In most cases I don't even see SLI enabled.


The documentation indicates 2 methods and I have tried both of them. It clearly states "one or the other" however the ONLY time I get SLI to appear enabled is when both are config'd and that is when I get everything running on GPU#2.



Per the guide:
Quote:
Q: I installed two videocards into motherboard, tried everything, but SLI don't appear
A: If you have old motherboard, based on mainstream chipsets like P965, P35, P45, P55 with lack of PCI-express lanes, you should check, which host feed PCI-Express slots for GPU's. For example if you have first PCI-E connected to northbridge PCI-E link, and second one connected to PCI-E from southbridge, then SLI can't be used. Graphics cards should have same host for SLI. For example, we tried three 8800 Ultra's on DFI UT P35 mainboard, but SLI enabled only for first two cards. On this motherboard, third GPU was connected to x1 PCI-Express of southbridge, no matter which slot size is. You can see this by looking pairs of traces from PCI-Express slot running to bridge.

Also check if SLIC certificate installed properly. To do this download latest version of Lavalys Everest diagnostic tool, and open section ACPI/DSDT there. You should have correct string in "SLI Certification". If there is "Not present" then try SLI patch install again.

They then provide a link to a screenshot of a system showing the DSDT edit
http://www.xdevs.com/sli/sliev.png

This is where my setup differs-- I NEVER see that DSDT edit no matter how many attempts or different methods that are used.

I was concerned that the configuration of my mobo may be causing the problem (1x pcie@x16 1x pcie@x4) but have found via the loveliness of google other users which have gotten this working on boards with identical lane layout, though admittedly I can't find a single person who has gotten this working on a P55A-UD3. I have attempted going back in BIOS versions (from F6 to F4) but this has not helped.


I have tried this on 2 Windows installs and have a backup for safekeeping so any suggestions no matter how silly/dangerous will be tried!
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post #50 of 1985
Quote:
Originally Posted by Wishmaker View Post
Is this approved by NVIDIA? If not, why is this on OCN?
Why do you even care? Way to piss in the punch bowl dude...

Modifying drivers is NOT piracy. The drivers are FREE and we can modify them and use them for whatever we want - for overclocking, over voltage, fan adjustments etc...... so find another thread to derail.
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